Ink Jet Recording Method And Recording Apparatus

Abstract

An ink jet recording method includes transporting a recording medium by a transport unit and ejecting an ink composition from an ink jet head to cause the ink composition to adhere to the recording medium that is being transported. The ink jet head is a line head having a length of a recording area of the recording medium or more in a direction crossing a direction of the transporting. The recording medium is an absorbent recording medium. The ink composition is a red-based aqueous ink containing a pigment. The pigment contains an azo-based pigment. A viscosity η1 of a mixed liquid when 10 parts by mass of the ink composition and 1 part by mass of an aqueous calcium propionate solution with a concentration of a Ca element of 0.3 mol/L are mixed together is less than 2.0 times a viscosity η0 of the ink composition.

What is claimed is: 
     
         1 . An ink jet recording method comprising:
 transporting a recording medium by a transport unit; and   ejecting an ink composition from an ink jet head to cause the ink composition to adhere to the recording medium that is being transported by the transport unit, wherein   the ink jet head is a line head having a length of a recording area of the recording medium or more in a direction crossing a direction of the transporting,   the recording medium is an absorbent recording medium,   the ink composition is a red-based aqueous ink containing a pigment,   the pigment contains an azo-based pigment, and   a viscosity η1 of a mixed liquid when 10 parts by mass of the ink composition and 1 part by mass of an aqueous calcium propionate solution with a concentration of a Ca element of 0.3 mol/L are mixed together is less than 2.0 times a viscosity η0 of the ink composition.   
     
     
         2 . The ink jet recording method according to  claim 1 , wherein
 a content of a solid content of the pigment is 0.5% by mass or more and 10% by mass or less with respect to a total mass of the ink composition.   
     
     
         3 . The ink jet recording method according to  claim 1 , wherein
 the pigment further contains a quinacridone-based pigment.   
     
     
         4 . The ink jet recording method according to  claim 1 , wherein
 the viscosity η1 is less than 1.5 times the viscosity η0.   
     
     
         5 . The ink jet recording method according to  claim 1 , wherein
 the ink composition contains a lactam-based compound, and   a content of the lactam-based compound is 0.5% by mass or more and 6.0% by mass or less with respect to a total mass of the ink composition.   
     
     
         6 . The ink jet recording method according to  claim 1 , wherein
 the ink composition contains an acetylene glycol-based surfactant.   
     
     
         7 . The ink jet recording method according to  claim 6 , wherein
 an HLB value of the acetylene glycol-based surfactant is 5 or less.   
     
     
         8 . The ink jet recording method according to  claim 1 , wherein
 the ink composition is a magenta ink.   
     
     
         9 . The ink jet recording method according to  claim 1 , wherein
 the azo-based pigment contains one or more selected from the group consisting of C.I.Pigment Red 150, C.I.Pigment Red 269, and C.I.Pigment Red 17.   
     
     
         10 . The ink jet recording method according to  claim 1 , wherein
 in the recording medium, a layer to absorb the ink composition contains a calcium salt.   
     
     
         11 . The ink jet recording method according to  claim 1 , wherein
 the ink composition contains a resin dispersant dispersing the pigment, and   an acid value of the resin dispersant is 250 mgKOH/g or less.   
     
     
         12 . The ink jet recording method according to  claim 1 , wherein
 a recording speed is 50 pages/minute or more.   
     
     
         13 . An ink jet recording apparatus for obtaining a recorded product by the ink jet recording method according to  claim 1 , the ink jet recording apparatus comprising:
 the ink composition;   the ink jet head; and   the transport unit.